WorksheetsClass test 5: 5.8.2020
Total questions: 10
Worksheet time: 7mins
LASING action depends on
Spontaneous emission
Stimulated emission
Spontaneous emission followed by stimulated emissions
Absorption of radiation
Semiconductor materials produces light
Silicon
Gallium
Germanium
None of the above
Combination of semiconductors that emits blue colour in LED
Gallium Arsenide
Gallium Nitrite
Gallium Arsenide and Phosphide
Gallium Phosphide
In a LED light output is directly proportional to the ---------------------------------
(a)
The switching speed of LEDs is in terms of
1nsec
1msec
1microsec
1sec
To turn on the LED in common anode type 7 segment display, LED is to be connected to Supply or to Ground?
(a)
If a laser diodes emits light in a direction parallel to the PV junction plane then laser diode is called
Edge – emitting LASER diode
Surface Emitting LASER diodes
Plane Emitting LASER diode
Diagonal emitting LASER diode
Lasers are used for a variety of applications. Which of the following is an example of areas that lasers are used.
commercial fields
scientific fields
medical applications
all of the above
To form a LASER diode Gallium Arsenide (GaAs) like materials are to be doped with
Aluminium
Silicon
Selenium
All the above
Which is the most commonly advertised types of laser surgery today?
laser dermatology
laser skin resurfacing
LASIK
tattoo removal
